Hydrophobic Interaction Chromatography Purification Method
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Solution Overview
Problem
Current hydrophobic interaction chromatography (HIC) methods face challenges in effectively purifying proteins, particularly at stronger binding conditions, as they result in decreased product recovery and contaminant reduction, with a critical partition coefficient (Kp) range that is difficult to maintain for efficient purification.
Innovation Solution
A novel HIC method that combines flow-through and bind-elute techniques under isocratic wash conditions, allowing a protein of interest to bind to HIC media at Kp values greater than 10, enabling greater purification and recovery by selectively releasing the bound protein while retaining impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If HIC is performed at stronger binding conditions to improve purification, then contaminant reduction is improved, but product recovery decreases
Solution Approach 1:
The patent segments the traditional single-mode HIC process into two distinct modes: flow-through mode for initial purification and bind-elute mode for enhanced contaminant removal. By dividing the purification process into sequential stages with different binding strengths, the method achieves both high product recovery in the flow-through fraction and effective contaminant reduction in the bind-elute fraction, resolving the contradiction between purification efficiency and product recovery
Solution Approach 2:
The patent dynamically adjusts the binding conditions by selecting appropriate Kp ranges for different modes: using lower Kp values (0.1-10) for flow-through mode to maximize product recovery and higher Kp values (>10) for bind-elute mode to maximize contaminant removal. This dynamic adaptation of binding strength to process requirements enables simultaneous optimization of both product recovery and purification efficiency
2Manufacturing precision
If Kp value is increased to enhance binding strength, then contaminant removal is improved, but load challenge at contaminant breakthrough decreases
Solution Approach 1:
The patent segments the purification process to perform contaminant removal at high Kp values only in the bind-elute mode, while the flow-through mode operates at lower Kp values to maintain high load challenge. This segmentation allows the system to achieve effective contaminant reduction without sacrificing overall productivity, as the high-binding-strength step is applied selectively rather than continuously
Solution Approach 2:
The patent changes the Kp parameter dynamically between process modes: maintaining lower Kp values during flow-through to preserve load challenge and higher Kp values during bind-elute to enhance contaminant removal. This parameter adjustment strategy enables the system to optimize both contaminant reduction and productivity at different stages of the purification process
3Loss of substance
If isocratic wash conditions are used at higher Kp values, then product recovery is improved, but washing effectiveness decreases
Solution Approach 1:
The patent segments the washing operation into two parts: isocratic washing at lower Kp values for the flow-through mode to maintain washing effectiveness, and elution at higher Kp values for the bind-elute mode to maximize product recovery. By applying different washing strategies to different process modes, the method resolves the contradiction between washing effectiveness and product recovery
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach achieves significant reduction in impurities, such as aggregates, and improves protein recovery, even at stronger binding conditions, by optimizing the Kp range for enhanced purification efficiency.
Implementation Method 1
Hydrophobic interaction chromatography (HIC) is a purification technique that exploits the interaction of HIC media with hydrophobic regions present on a protein of interest
Data Source
AI summary
The present invention is directed to methods for purifying a protein of interest, e.g., an antibody, from a sample comprising the protein of interest and at least one impurity, e.g., an aggregate, by employing a hydrophobic interaction chromatography (HIC) method that allows for binding of both the protein of interest and the at least one impurity under strong binding conditions. The present invention is based, at least in part, on the finding that both flow through and bind-elute techniques can be combined to achieve greater purification and recovery of a protein of interest, e.g., an antibody, under isocratic wash conditions and strong binding conditions.